Guess since I started it, I can contribute...
"I did not choose to strike you. You chose to place yourself in the path of my fist."
"When the battle is over, I will hire a necromancer so that you will be able to deliver the bad news to your family in person."
"As a favor to you, I will be sure to leave scars that you can show off to your tavern friends."
"Those aches you experienced as a child were not 'growing pains'. They are the lingering effects of the beating I am about to give you."
"Many years from now, when your joints and bones ache with the coming rain, remember that you could have avoided that agony had you only swallowed your pride today."
"My master taught me there are ten thousand pressure points on the human body. Today you shall learn numbers 4010 through 4073."
"Tell me, did you wake up this morning and say to yourself 'I wish to spend my afternoon bleeding internally'?"
"I knew I should have worn the red robes today. I'll be scrubbing your blood out of these for hours."
"What is the sound of one hand clapping?" *slap* "You're welcome."
"By all means, keep your blade. The breeze it stirs up as it goes by is quite refreshing."